The superproject *is* a ref.
You cannot prune the subprojects on their own. That's the *only* real
special rule about subprojects. Exactly because pruning them on their own
is not a valid op to do.
It's the same way with an source of "alternate" objects (or a shared
object directory) - you'd better not prune them, because other projects
may have refs to them that you don't know about locally. So this isn't
somethign new to subprojects.
Linus
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